1.They have provided thousand of people with food.
⇒Thousand of people have been provided with food by them.
2.I was watching the news on TV at 8.00 last night.
⇒The news was being watched on TV at 8.00 last night.
3.Do they play football?
⇒Is football played by them?
4.Students must not leave bicycles in the hall.
⇒Bicycles must not be left in the hall.
5.I thinks he is honest.
⇒He is thought to be honest.
6.The teacher corrects our exercises.
⇒Our exercises are corected by the teacher
7.Liz took that book from the desk.
⇒That book was taken from the desk by Liz.
8.People said that he left the town.
⇒It was said that he had left the town.
9.How many students did you teach.Sir?
⇒How many students were taught by you, sir?
10.The staff is going to explain the problem to the president.
⇒The problem is going to be explained to the president by the staff.